Garment finishing machine



Feb. 20, 1962 v. R. CARPENTER ET AL 3,021,606

GARMENT FINISHING MACHINE 3 Sheets-Sheet 1 Filed Feb. ll. 1959 A 00 .w.. 00 000 0000000 0 0000 0 0 0 00.0000000000 ...0030... VN00000000 ro.. n

Feb. 20, 1962 V. R. CARPENTER ET AL GARMENT F'INISHING MACHINE 3 Sheets-Sheet 2 Filed Feb. ll, 1959 /NvsNrmes VlRcm. R. CRRRENTER unLLmm M. TURNER Feb. 20, 1962 v. R. CARPENTER ET AL 3,021,606

GARMENT FINISHING MACHINE 5 Sheets-Sheet 3 Filed Feb. l1

IOS

VIRGIL R. CARPENTER \Al\\.\.\9\\"\ M TURNER BY HTTOR/VEYS nite tre This invention relates to garment finishing machines and more particularly to machines for finishing garments of the coverall type. it is well known that a coverall garment is made to cover vthe entire body of the worker except for the head, hands, and feet. It includes a body portion having a collar, usually of the standup variety, a front open-ing on one side flap of which are buttons and on the other side flap of which are corresponding button holes. The front opening runs from the collar `to the crotch of the garment. The body portion has on it sleeves for the arms of the wearer and leg portions for the legs of the wearer. Garments of this type are generally of comparatively heavy material and in use they may become exceedingly grimy and dirty. For laundering these garments proper washing equipment is needed and they are then finished.

The finish which is customarily needed on Coverall type garments does not usually necessitate ironing in the usual sense, but the garment must be dry, reasonably smooth and free from wrinkles, and capable of being folded into a neat package for handling and dispensing. It is an object of this invention to provide an improved method and apparatus for the finishing of Coverall type garments and particularly to provide method and apparatus for quickly and efiiciently, and at very low cost, removing the relatively large quantities of water which are contained in damp dry garments of this type.

It is another object of the invention to provide an improved method and apparatus for finishing Coverall type garments wherein the garment is moderately inflated during its finishing period so as to be free from wrinkles.

It is a further object of 4the invention to provide a method and apparatus for finishing large numbers of coverall type garments expeditiously and with good effect, and at low cost. It is a further object of the invention to provide an improved method and apparatus for nishing Coverall type garments with great rapidity.

It is also an object of the invention to provide an improved method and apparatus wherein portions of the garment which are of double or triple thickness, as for example, seams, collars, button and button hole strips, and the like, are as effectively dried and finished as other portions of the garment wherein there may be only one layer of cloth involved.

Other and further objects are those inherent in the invention herein illustrated, described, and claimed, and will be apparent as the description proceeds.

To the accomplishment of the foregoing and related ends, this invention then comprises the features hereinafter fully described and particularly pointed out in the claims, the following description setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principles of the invention may be employed.

The invention is illustrated with reference to FIGURE l which is a perspective View illustrating the principal components of the apparatus with the garment associated therewith and illustrating the method of the invention;

FIGURE 2 is a side elevational view of the components of a garment drying machine made in accordance with the present invention and iHustrating the method of the invention;

3,021,606 Patented Feb. 20, 152

FIGURE 3 is a sectional view taken along the line Iand in the direction of arrows 3-3 of FIGURE 2;

FIGURE 4 is a fragmentary sectional view taken along the line and in the direction of arrows 4 4 of FIGURE 3;

FiGURE 5 is a fragmentary vertical side elevational View taken along the line and in the direction of arrows 5 5 of FIGURE 2;

FIGURE 6 is a fragmentary horizontal sectional view taken along the line and in the direction of arrows 6-6 of FIGURE 2;

FIGURE 7 is a fragmentary somewhat enlarged view of a typical collar clamp mechanism as used in the present invention;

FIGURE 8 is a side elevational view of a modified form of machine of the present invention;

FlGURE 9 is a fragmentary somewhat enlarged perspective view of the upper portion of the machine shown in FIGURE 8 taken from the front and slightly to the side thereof;

FIGURE 10 is a fragmentary enlarged view of the garment supporting portion of the apparatus shown in FIG- URE 8.

Throughout the drawings the corresponding numerals refer to the same parts.

According to the present invent-ion a damp dry cover all garment, generally designated lll, is supported by the collar band of the garment, with the collar open, and with the button strip along the front of the garment separated from the button hole strip so as to form a V-shape space through which hot air may be introduced under slight pressure. The form on which the collar is supported is of wire or expanded metal so that air can blow out through and over the upper edge ofthe colla-r that is supported thereon, but the collar form is sealed at the top so that air cannot be blown outwardly therefrom. A current of heated air is then blown into the garment through the opening between the button strip and buttonhole strip from some lowermost position of that opening where the flaps may be relatively close together on up to the widely spread apart front portion of the collar, and this heated air, being unable to pass outwardly through the neck of the garment, due to the closure of the top of the collar form at that point, is forced to travel into the garment, thereby causing the garment to be bulged out to the limit of expansion, as provided by the structure of the garment and the pressure of the air. pressure is developed although a very large quantity of heated air is used, but this is enough pressure to balloon the garment out. The air passes into the body of the garment and thence outwardly through the sleeve and leg. It is noted that the support of the garment is via the collar support and along the front opening, and if desired, also by means of a light frame inside the garment near the collar, although this latter is only effective toy support the shoulders and yoke While the garment is wet and before the drying (and ballooning of the garment) begins. Otherwise, the garment hangs freely when it is wet and during drying. After the inilow of air into the garment is established, it is preferable, in accordance with the invention, to slightly restrict the lower ends of the legs so as somewhat to restrict the flow of air therefrom, thereby sustaining the pressure within the garment. It is found unnecessary to restrict outflow of air through the arms.

.At the outset the flow of Warm air meets with resistance against passage through the pores of the cloth, due to the fact that the water content of the cloth of the garment makes the cloth somewhat impervious to the flow of air. The hot air is thus efficiently used for ballooning and dewrinkling as well as for drying off the inside of the garment. The button strip and buttonhole strip of the garment are supported by a reticulated frame at the point of inflow of warm air, and are so supported that the hot air Not very much flows turbulently around the edges of and also through these strips, thereby enhancing the drying of these por tions of the garment which may be double or triple thickness fabric. Ilt is preferable to support the collar on a form which is of reticulated metal so that an outflow of air can occur through the collar itself even while it is supported. Also, the legs are deformed a little at the bottom by light clamps of reticulated metal so that the cross-sectional shape of the leg at the lower end is reduced and the outflow of air is somewhat restricted even through the air can still flow out through the garment material at the lower ends of the legs while they are so restricted. ln most instances it is not necessary to restrict the outilow of air through the sleeve since the length of the sleeve and its size inherently forms a sufficient restriction to the ilow of air therethrough.

As the drying commences, the moisture of the cloth itself insures the establishment of a sufficient static pressure so that wrinkles in the garment are stretched out. No attempt is made to grip the button strip and button hole strip throughout their entire length and air hows into the garment between the portions of the length of these strips which are lightly gripped, and once into the garment the air may flow out between those portions of the length of these strips which are 'below the portions that are gripped, i.e. toward the crotch. The gripping of the button strip and button hole strip is preferably accomplished very lightly by merely holding the edge of the hot air delivery duct against those portions of the -garment that are adjacent the button and button hole strips of the garment, while they are supported on the reticulated plate through which the hot air freely flows.

A blower, not illustrated in FIGURE 2, is provided to push air through a heat exchanger from which it is delivered to duct The air should be delivered at duct 20 at a pressure of 1/2 to 3" of water static pressure and at a temperature of 200 to 300 F. While precise control -is unessential it has been discovered that good results can be obtained using air at about 3/4 of water pressure and 250 F. temperature.

Referring to FIGURES l and 2 particularly, one exemplary form of apparatus of the present invention comprises a duct work generally designated 20 which is the termin-al end of a duct leading from a heat-exchanger, not shown in FIGURE 2. Incoming air into the blower may be at room tempera-ture and is thence passed through a heat exchanger such as a radiator, thereby elevating the temperature of the air to 150 to 300 F. or even higher. The air is then delivered to the duct Z0 as indicated by the arrows 2i and flows lthrough this duct to its terminal edge at 22.

As shown in FIGURE 3, the specific cross sectional form of duct has a broader top at 23 than the bottom 24 and has sides 25 and 26. The terminal edges are formed so as to present a piane, which is the plane of line 3-3 of FIGURE 2, in this form of the apparatus of the invention. This terminal edge is preferably provided with a soft but relatively narrow gasket 27, which can if desired, be of 'soft molded material such as rubber as shown in FIGURE 4. This soft molded edge has an opening 27A therein so as to provide a soft and resilient outer surface 27B and a plurality o f flanges 27C which are gripped between the outer edge 22A of the ducts, and an internal flange 243, which is formed around the mouth of the duct. In this way the gasket is easily supported. In the form of the invention shown in FIGURE 2, the angularity of the plane 3-3 as shown for the angle K, in FIGURE 2, is preferably 60S0, as for example 75 Within the ducts is a parallelogram linkage comprised of a pair of parallel arm-s 30 and 31 which are pivoted at 32 and 34 on the brackets 35 and 36 mounted on the door of the duct. In this form of the invention the two arms 36 and 31 are the same length and by means of pivots 37 and 38 on the top thereof there is mounted a stout bar 39 which extends forwardly and at its forward end has a mounting plate at 40 on which the garment supporting entity generally designated 41 is mounted. If desired, provision may be made for adjusting the whole entity with reference to the axis of the bar 39 so that its plane can be shifted to fit neatly against the plme of the gasket 27 when the parallel arm linkage moves to the dotted line position as shown in FGURE 2. Rearward movement from the full line to the dotted line position in FiGURE 2 is encouraged by means of the spring 4d which isanchored to the -pivot 3S and to a clip 4S inside the duct work. The weight of the garment supporting entity is such that when the entity is pulled forward the spring 44 is not quite strong enough to pull it back to the dotted line position, particularly when a garment is hanging thereon, as a detent, not illustrated, may be provided for holding the garment supporting entity in a forward position during the loading operation.

This garment supporting entity il is shown in FIG- URES 2 and 5, and consists of a frame generally designated d6 which is approximately the same in shape as the outlet shapeof the duct 20 at the plane 3-3 but a little larger all around. However, as shown in FIGURE 5 (which illustrates another modification) there is no requirement that the shape of the frame 46 be precisely the same as the end of the duct. Thus, in FIGURE 5, the edges 46A and 46B slant downwardly but at a some- -what lesser angle the corresponding edges of the gasketed edge 22. Also, the frame d6 has a rounded bottom at 46C which generally cuts across the lower corners of the gasketed edge 22 of the duct work. The top 46D corresponds approximately with the top level of the duct when the garment supporting enti-ty is in place against the duct. The garment supporting entity also has on it the collar supporting portion at 47 which extends vertically upwardly and has an upper edge 47A and a lower edge 47B both reinforced suitably. The frame 46 has stretched thereacross reticulated metal or wire as at 48 and the collar form has wire at 4S. The plane of frame 4-6 is sufficiently reinforced around the edge 46 so that it is strong enough to support Ithe garment and does not distort in service. Also, extending from this frame 46 and at a level somewhat below the collar form 47 there is a single rod S0 which is somewhat -larger than the collar in dimension and loops around from the width of the bars 46A and 46B, as shown in FIGURE 5, and thence broadens out a little larger and extends rearwardly around a curved line generally below the collar. Upon the entity 4l there is a solid closure plate S2, as shown in FIGURE l which prevents outilovv of air through what would be the neck opening. On this plate at either side there is mounted a collar clamp 54 and 55, one at each side. These are collar clamps of any conven-tional form which per se, form no part of this invention. They are shelf items and several forms of clamps are commercially available.

The main body 29 of the clamp 54 shown in FIGURE 7 is attached to the cover plate 52 by rivet 29A. A handle 43 and clamping arm 33 are mounted on the body Z9 at pivots 43A and 33A respectively and are joined by a link 53 between pivots 43B and 33B on the handle and clamp respectively. To open the clamp, a lifting force is applied to the handle causing it to rotate about its pivotal mounting in the direction of arrow 42. This force passes through the link to the clamping arm. at point 33B, thus causing the clamping arm to follow the handle in a rotary course about its own pivot 33A until both the handle and clamping arm have reached the dotted-line position of FGURE 7. After the collar has been received against the surface 49A of the wire 49, the handle, and consequentially the clamping arm, are lowered to the fullline position of FIGURE 7 where the clamping surface 33C of the arm 33contacts the collar and holds it between its own surface and the wire surface 49A. In this position handle 43 has lowered its pivot 43B to a position which is slightly over-center (Le. below) the line of pivots 33B and 43A and hence the clamp is self-locking,

spawns.

but yet can be easily opened. Any other convenient collar-clamp which has a small area of contact with the collar, can be used.

The collar clamp may be opened so as to permit the collar to be placed against the form and then the clamp is actuated so as to clamp the collar.

When the garment is in damp condition and ready to be dried, the garment supporting entity 41 is moved to the full line position shown in FIGURE 2. The operator then holds the garment vertically with the collar spread open and the button strip and the buttonhole strip likewise spread open so that they present roughlyA a V-shaped opening along the front of the garment. The front of the garment is away from the operator. The operator then bends the collar band around the collar portion 47 of the garment supporting entity so that the collar lies on the collar form. The collar clamps are then snapped downwardly into the full line position shown in FIGURE 7 and this holds the front ends of the collar and hence the whole garment is suspended. It will be noted in this position that the still wet garment supporting entity is at a position spaced away from the end of the duct 22 along the plane 3 3, as shown in FIGURE 2 and the damp garment hangs vertically. The bar Sti serves somewhat to spread the shoulder portions of the garment and helps support the wet garment, although no attempt is made :to obtain a spreading of the garment at the shoulders, which would be the equivalent of shoulder shape. The sleeves and legs then hang almost vertically downwardly.

At the lower part of the machine there are a pair of leg clamps generally designated 6ft- 68, these being identical and positioned so that when the garment supporting entity is pushed against the duct ZI, the lower damp ends of the legs of the coverall garment will naturally position themselves between the two portionsv @A and 56B of the leg clamps which are then spread to the open (dotted line) position as shown in FIGURE 6. These leg clamps have a sutlicient vertical dimension V, as shown in FIGURE 2 so that they will embrace any size or height of garment which is hung on the garment supporting entity 41. Each of the clamps 69 consists of a pair of trunnion posts 61A and 61B. On these are supported trunnion pipes 62A and 62B. These pipes each respectively support a forwardly extending frame as at 64A and 64B. These frames are generally rectangular in crc-ss section as viewed from the position shown in FIGURE Z, but they present a slight curve when viewed from the top. The frames 64A and 64B serve to support an open wire mesh at 65A and 65B which serve very gently to compress the lower edge of the pulled out leg portions when the air is owing through the garment and hence reduce the cross sectional area of the leg. The circular cross section shown at CI in FIGURE 6 is due to the internal pressure of the air owing through the garment and when the leg clamps close the legs are squeezed to roughly an eliptical form shown at EL in FIGURE 6.

It may be noted from an inspection of FIGURE 2 that when the damp garment is hung on the garment supporting entity all, with the collar portion 10C of the garment gripped against the collar support d'7, and the shoulders of the garment generally supported by the frame 1, the spread apart front ends of the collar may be long enough to come around and lie on the reticulated part of the collar form or only long enough to lie on the wire form a9. Also the button strip and the button hole strip of the -garment as shown at IGF and 10G respectively, will be spread apart and will hang generaily vertically downwardly from the upper portion of the wire work 43 on the frame 46. In this position the button strip lill: and the buttonhole strip IGG will moved from the full line to the dotted line position shown in FIGURE 2, the button strip lF and button hole strip NG and (Where the collar is large) the front ends of the collar will be pushed by the wire work 4S towards the front edge 27 of the duct. This edge is quite narrow and hence these portions ltlC, ltlF, and lG'G of the garment will simply lay against the wire 48, being pressed there against by the ensuing blast of heated air which moves through the duct 22 and into the garment between the edges 19E and IGG.

This movement of air into the garment immediately puits out the garment so that it assumes a vertical portion lbulged across the back as shown in FIGURE l with the arms quite 'circular and bulgcd out and away from the garment body, and with the legs bulged to a more or less circular condition. The legs which had previously hung limp between the spread apart clamps titi-6i? now assume a somewhat cylindrical configuration as indicated at Cl of FIGURE 6. The operator then by appropriate air control, not shown energizes the air cylinder 68 of the leg clamps and the clamps are moved from the dotted to the full line position as shown in FIGURE 6 and slightly grip the lower ends of the legs, thereby somewhat impeding this outow of air from the legs. Automatic control of the leg clamps can, of course, be used with the cycling controlled in respect to the complete cycle of tinishing. The heated air iiow through the garment soon dries the garment and the extension of the garment imposed by the slight pressure within the garment removes all but the most stubborn Wrinkles in not only the body of the garment but also the sleeves and legs. The incoming airow on the button strip and button hole strip and up and around the collar through the wire work 49 of the collar support, dries these multiple ply thicknesses of the garment readily and completely.

Referring to the form of invention shown in FIGURE 8, in this form the machine is indicated as having an air inlet 100. A multiple stage blower fan at lill forces the air in the direction of arrows 102 through a heat exchanger section 163 which is supplied by steam pipe 1M and has a condensate return which directs the ow of air into the garment support as shownby the arrows 167.

The garment supporting framework as shown in FIG- URES 8, 9, and 10i, is approximately the same as shown in FIGURES l-7, except that the cross sectional shape of the outlet portion lil-S of the plenum chamber 1M is of rectangular shape and the frame 199 and Wire covering 11@ is shaped so as slightly to overlap the sides and to overlap to greater extent the bottom of the duct.

In this form of invention also the plane of the end of the duct at the line llildll is vertical. In order to facilitate hanging the wet garment on the garment supporting entity 1441 that entity is supported so that it will assume a somewhat tilted position as shown in dotted lines at 141A in FIGURE 8. To accomplish this, the supporting arms 131 and 130 are made of diiierent lengths, the arm 136 being made longer than the arm 1.3i. ,As a consequence the supporting bar 139 on the upper ends of these arms 13d-131 is moved from a horizontal position shown in FIGURE 8 to a tilted position as shown at 139A, which is the loading position. In this position the plane of frame 169 is somewhat tilted, and is forced lto a position such that the angle X as shown in FIGURE 8 is from (S0-80, preferably around 75. This is provided so that when the wet garment is draped on the garment supporting entity 14E it will hang straight down between the garment supporting entity and the end of the duct Work. However, as the garment supporting entity is moved to the working position shown in full lines in FIGURE 8, the plane l@ will rotate as it moves, so as to coincide with the plane 1I0-110. It will be noted that in the loading position which is shown in dotted lines in FIG- 7 URE 8 the garment supporting entity is spaced slightly from the upper portion of the duct 106,. so as to allow the garment to be hung and also the button and buttonhole strips, to be moved around freely by the operator. The lower portion of the frame it@ is quite widely spaced from the lower portion of the duet.

The garment is hung on the supporting entity 1141 in exactly the same manner as previously described with reference to the form of invention shown in FEGURES l-7 and the collar is clamped in place and held by the collar clamp 54. After the garment is loaded onto the entity 141, the latter, with the garment thereon, is moved to the position shown in full lines either by the action of a spring, not illustrated, or'by the action of an air cylinder, not illustrated. This allows the clamp legs to fall into place between the then open leg clamps. The fau itil is then started and the hot air is driven through the garment in precisely the manner previously described and expansive stretching and wrinkle removal, as Well as drying takes place. After the drying cycle is initiated the leg clamps 16d at the base of the machine (which is constructed as previously described) are moved to the clamping position and thereby slightly restricting the cross section of the lower ends of the legs of the garment and this causes the pressure established in the garment to be reasonably high. at the bcginning. Gf course, as the drying progresses vand the garment obtains a more porous condition there is a greater outflow of air through the dry garment.

In both embodiments, forward movement of the garment support is limited by a stop (see 44A and 144A) and movement toward the duct end is biased by a spring (see 44 and 144).

As many widely apparently diierent embodiments of this invention may be made without departing from the spirit and scope thereof, it is to be understod that we do not limit ourselves -to the specific embodiments herein.

What we claim is:

1. An apparatus for finishing a damp garment of the Coverall type which has a body having legs and sleeves thereon and a collar and an opening extending up the front of the garment from near the crotch to the collar, said opening having separable edges with cooperating fastening elements therealong, comprising a duct having a terminal edge forming a discharge port, the plane of said port being upright, means for delivering heated air through said duct for discharge from said port, a reticulated panel covering said terminal edge and the port defined thereby, panel mounting means for mounting said panel for movement from a position where it is against the edge of said port to a position in which it is generally upright but spaced from said port, a collar form having a generally upright outer surface attached on that side of said panel which is away from the port and shaped so as to enclose a space similar to an open collar, a closure over said space, and collar clamps engageable with the outer surface of said collar form.

2. The apparatus of claim 1 further characterized in that said collar form is made of a reticulated material.

3. The apparatus of claim l further characterized in that said panel mounting means is made for moving said panel downwardly as the panel is moved outwardly from said port.

4. The apparatus of claim l further characterized in that said panel mounting means is made for moving the lower portion of the panel away from said port a greater distance than the upper portion is moved.

5. The apparatus of claim l further characterized in that said duct is shaped so that 'the port is in a plane which is slanted toward the duct at the top and said panel is provided with panel mounting means for translatory movement of the panel when it is moved away from the port.

6. An apparatus for finishing a damp garment of the coverall type having a body having legs and sleeves thereon and a collar and an opening extending up the iront of the garment from near the crotch to the collar, said opening having separable edges with cooperating fastening elements therealong, comprising an air duct having an endv edge defining a port, air heating and blower means connected thereto for delivering heated air through said port, means for lightly supporting the front of the garment against said port with the separable edges separated and extending across the edges of said port, means for holding the collar of the garment in open position with the opening of the collar toward said port, means for closing the neck opening of the garment against substantial outflow of air, and leg clamp means on the machine and below the port for compressing the legs at their lower ends.

7. The apparatus of claim 6 further characterized in that said leg clamps are pairs of wings, said pairs being mounted below the duct so that the legs of the garment hang, one leg between each pair of wings, when the garment is in place against the duct.

8. The apparatus of claim 7 further characterized in that means is provided for operating the leg clamps.

9. The apparatus of claim 7 further characterized in that said means for supporting the garment is mounted for movement toward and away from the plane of said port.

l0. The apparatus of claim 7 further characterized in that said means for supporting the garment is a panel of retriculated material which extends across the port and that the means for holding the collar is of a light reticulated frame which holds the collar as though open with the open ends of the collar adjacent the edges of said panel.

`ll. 'l`he apparatus of claim 6 further characterized in that said means for lightly supporting the garment includes a frame extending outwardly from the port for engaging the inside of the yoke and shoulder portions of the garment.

12. An apparatus for linishing a damp garment of the Coverall type which has a body having legs and sleeves thereon and a collar and an opening extending up the front of the garment from near the crotch to the collar, said opening having separable edges with cooperating fastening elements therealong, comprising a duct having a terminal edge in a generally upright plane forming a kdischarge port, means for supplying heated air under a few inches of water pressure for discharge through said port, a pair of radius arms each having a distal end and a proximal end pivotally attached to the duct to support said distal ends for swinging movement forwardly and backwardly in said duct, a support bar pivotally attached to said distal ends for movement of the bar forwardly and backwardly in a generally endwise direction in said duct, that portion of the support bar which is nearest the port being provided with a mounting head, a panel of reticulated material attached to said mounting head, said panel extending slightly beyond the top and sides of said port, means for biasing the support bar for movement towards said port, a collar band support on that side of the panel which is away from the port, said band extending from one edge of the panel, thence outwardly and around a curve to the other side of the panel and a closure over the space enclosed by said panel and band.

13. The apparatus of claim 12 further characterized in that means is provided on that side of the frame which is away from the port for lightly engaging the inside of the yoke and shoulders of the garment.

14. Apparatus for finishing a garment of the Coverall type which has a body having legs and sleeves thereon and a collar and an opening extending up the front of the garment from near the crotch to the collar, said opening having separable edges with cooperating fastening elements therealong, comprising a duct having a terminal edge forming a discharge port, means for delivering a heated fiuid through said duct for discharge from said port, means for lightly supporting the front of the garment against said port withv the separable edges separated and extending across the edges of said port, means for holding the collar of the garment in an open position with the opening of the collar toward said port and means for closing the neck opening of the garment against substantial outflow of uid.

15. The apparatus of claim 14 further characterized in that the means for supporting the front of the garment against said port includes a frame approximately the 10 same shape as said terminal edge and means for mounting said frame for movement from a position where it is against said port to a position in which it is generally upright but spaced from said port.

References Cited in the tile of this patent UNITED STATES PATENTS 2,241,702 Glover May 13, 1941 2,378,565 Locke et al June 19, 1945 2,521,297v Littell Sept. 5, 1950 2,883,092 `McMi1lan Apr. 21, 1959 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,021,606 February 20, 1962 Virgil R. Carpenter et ala It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 4, line 14, for "as" read or Singed and sealed this 26th day of June 1962,.

(SEAL) Attest:

DAVID L. LADD ERNEST W. SWIDER Commissioner of Patents Attesting Officer 

